Materials Literature
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OBJECTIVE: The purpose of this study was to investigate the effects of piroxicam co-administration with ethanolic stem-bark extract of Khaya senegalensis on biomarkers of oxidative stress and gastro-toxicity in Wistar rats. MATERIALS AND METHODS: Thirty healthy male and female Albino Wistar rats (190-220 g) were group…
The first European occurrence of slawsonite is reported from a picrite sill within Upper Ordovician strata of the Prague Basin near the village of Rovina, Czech Republic. The rare slawsonite forms an interstitial phase in association with abundant celsian and hyalophane, replacing the original calcic plagioclase (byto…
The technical specifications of a thermal tomographic unit are described and the experimental data on tomographic analysis of impact damage in carbon fiber-reinforced plastic are reported.
The currentless deposition of Cu 2+ , Ag + , and other cations from solutions of their salts takes place on the surface of hydrogen-saturated palladium (Pd-H). It is hypothesized that this process occurs via a catalytic chemical mechanism. It is demonstrated that 80–90% of the copper deposits onto Pd-H from a CuSO 4 s…
Regional groundwater flow and transport models were substantiated for the site of underground disposal of liquid radioactive waste from the Siberian Chemical Combine. The migration of a neutral component and two radionuclides (90Sr and U) in groundwaters was predicted for the long-(1000 years) and super-long-term (10…
The Pd/Al 2 O 3 catalysts were prepared by the impregnation of aluminum hydroxide, which was synthesized by precipitation in the presence of polyvinyl alcohol, with a solution of palladium nitrate and were heat-treated at different temperatures. The resulting samples were characterized by X-ray diffraction, electron m…
Enzyme immobilization is an operative method for improving enzyme properties. There are various supports to enzyme immobilization. In the present study chitosan nanoparticles have been applied to alkaline phosphatase (ALP) immobilization due to their special properties. Firstly, the ionic gelation method was used to s…
The structure of the effective one-electron Hamiltonian $$\hat R$$ in the Hartree-Fock equation $$\hat R \varphi _i = \varepsilon _i \varphi _i$$ is discussed in many works. The most general definitions of $$\hat R$$ , satisfying all necessary conditions imposed by the variational principle for the energy in open shel…
The stimulated emission threshold of surface plasmon polaritons (SPPs) propagating at the interface of silver and dye-doped polymer can be reduced by an order of magnitude if the operation range is changed from visible to near-infrared. The stimulated emission is observed at the polymer thickness, which is much below…
This is an analysis of the properties of quasi-local vibrations, and the conditions of the formation thereof, in a realistic model of the crystal lattice on a microscopic scale. The evolution of quasi-local vibrations with an increase in the concentration of impurity atoms, is examined. It is shown that the formation…
Elements of aircraft that are in direct interaction with the environment are exposed to the destructive effects of weather phenomena and the factors influencing them, as well as local environmental phenomena. One such factor is ultraviolet radiation emitted by the sun. This article presents the results of the influenc…
This paper presents a new method of designing optical coatings, using evolutionary strategies based on genetic algorithms. It discusses methods of encoding alternative solutions and genetic operators of crossover, selection, genetic pressure, and mutation as applied to problems of synthesizing multilayer thin-film sys…
The results of investigation of electrically-detected electron paramagnetic resonance (EDEPR) and classical electron paramagnetic resonance (EPR) (X-band) for the identification of shallow and deep boron centers, NV Si defects, and isolated silicon vacancies (V Si), which are formed directly during the preparation of…
Silylated Ti catalysts based on hexagonal mesoporous silica (Ti-HMS) were prepared by chemical vapor deposition of TiCl 4 on HMS silica modified by vapor silylation. The influence of TiCl 4 deposition conditions on surface properties and catalytic performance of the catalysts were investigated. Among the methods used…
Intermetallic Ru 2 Sn 3−δ was found to show high thermoelectric performance of ZT ∼ 0.3 at temperatures around 660 K. The transport properties, combined with the electronic structure calculation, indicate that Ru 2 Sn 3 is a semi-metal with contrasting dispersions between the hole and electron bands, which generate a…
The aim of this work was to study the effect of montmorillonite (MMT) on the flame-retardant and mechanical properties of ethylene-propylene-diene monomer (EPDM). EPDM/MMT composites were prepared by conventional compounding of EPDM matrix with MMT. The cure characteristics, tensile properties, wear resistance, therma…
With the development of ultra-large scale integrated circuits, ruthenium has been used as one of the most promising barrier materials for copper interconnects by replacing the conventional Ta/TaN bilayer film. However, during the polishing process of Ru/Cu structure using KIO4slurries, the galvanic corrosion of copper…
Abstract The need to increase transistor packing density beyond Moore's Law and the need for expanding functionality, realestate management and faster connections has pushed the industry to develop complex 3D package technology which includes System-in-Package (SiP), wafer-level packaging, through-silicon-vias (TSV),…
As device dimensions shrunk to the 14 nm node and beyond, damascene Cu/low-k high aspect ratio of interconnect schemes face extreme difficulties in achieving defect-free Cu gap-fill. The CVD Co was implemented to improve Copper interconnect performance which was deposited between the PVD Ta(N) liner barrier and the Cu…
Transesterification of diethyl oxalate (DEO) with phenol over MoO 3 -SiO 2 catalysts prepared by the sol-gel technique (MoO 3 -SiO 2 (SG)) and the impregnation method (MoO 3 -SiO 2 (I)) was conducted to produce diphenyl oxalate (DPO), which can be used as a precursor for manufacturing diphenyl carbonate (DPC). The sam…